Django display forms.ValidationError at template - django

Question

My Django application uses a token based password reset mechanism, but I'm currently not able to display any error message at my template if "user is not None and str(form_token) == str(user.reset_token)" is not given
-> Error if my input is a none existing user:
File "/app/App_Accounts/views.py", line 280, in reset_password
user = form.save()
File "/app/App_Accounts/forms.py", line 315, in save
user = User.objects.get(user=form_user)
App_Accounts.models.User.DoesNotExist: User matching query does not
exist.
views.py:
def reset_password(request):
if request.method == 'POST':
form = TokenPasswordResetForm(request.POST)
if form.is_valid():
user = form.save() # line 280
....
forms.py:
class TokenPasswordResetForm(forms.Form):
error_messages = {
'password_mismatch': _('Password fields didn’t match, please try again'),
'user_or_token_mismatch': _('Unable to find user or token match'),
}
user = forms.CharField(
required=True,
strip=False,
)
reset_token = forms.CharField(
required=True,
strip=False
)
new_password1 = forms.CharField(
label=_("New Password"),
strip=False,
widget=forms.PasswordInput(attrs={'autocomplete': 'new-password'}),
)
...
def __init__(self, *args, **kwargs):
super(TokenPasswordResetForm, self).__init__(*args, **kwargs)
self.fields['user'].label = 'Username:'
...
def save(self, commit=True):
"""Save the new password."""
form_user = self.cleaned_data.get('user')
form_token = self.cleaned_data.get('reset_token')
user = User.objects.get(user=form_user) # line 315
if user is not None and str(form_token) == str(user.reset_token):
password = self.cleaned_data["new_password1"]
user.set_password(password)
user.reset_token_memorized = False
user.reset_token = reset_token_generator()
if commit:
user.save()
return user
raise forms.ValidationError(
self.error_messages['user_or_token_mismatch'],
code='user_or_token_mismatch',
)
models.py
class User(AbstractBaseUser):
id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
user = models.CharField(verbose_name='Username', unique=True)
...